I. Print out or draw Stencil 1, 2 and 3 on a paper or directly print on the card paper given in the above downloadable guide. Cut out the sample pattern (including eyeholes) for your 3D glasses and tape the sides to the center section. You now have your stencil for the glasses.

II. Trace the stencil on the card paper. Cut the glasses out making sure to also cut out the eyeholes. Use a double layer of card paper, as a single layer may be too thin. Stick the identical layers of card paper to each other and let them dry. If you want, you can draw it directly on the card paper, but the stencil way is better, as it leaves no margin for error.

III. Tape the red (left) and green or blue (right) gelatin paper pieces to cover the eyeholes. Cut the gelatin paper so that it is a little larger than the opening for the eyes. Make sure that you use a double layer of the gelatin paper for each eye as a single layer may be too light. If you want to create Cyan, you can use one layer of green and one layer of blue gelatin paper.